| Thailand Open | 05/31 10:20 | 5 | Sitthikom Thammasin v Jun Hao Leong | L | 1-2 | |
| Malaysia Masters | 05/24 02:55 | 5 | Sitthikom Thammasin v Magnus Johannesen | L | 1-2 | |
| SEA Games | 05/08 05:30 | - | Vannthoun Vath v Sitthikom Thammasin | W | 0-2 | |
| Orleans Masters | 04/05 10:50 | 5 | Jan Louda v Sitthikom Thammasin | L | 2-0 | |
| Spain Masters | 03/29 10:20 | 5 | Srikanth Kidambi v Sitthikom Thammasin | L | 2-1 | |
| Swiss Open | 03/22 13:40 | 5 | Sitthikom Thammasin v Koki Watanabe | L | 0-2 | |
| All England Open | 03/15 10:00 | 5 | Sitthikom Thammasin v Lee Zii Jia | L | 0-2 | |
| Thailand Masters | 02/01 06:40 | 5 | Thammasin Sitthikom v Anders Antonsen | L | 0-2 | |
| Indonesia Masters | 01/25 01:20 | 5 | Sitthikom Thammasin v Guang Zu Lu | L | 1-2 | |
| Australian Open | 11/16 02:40 | 5 | Koki Watanabe v Sitthikom Thammasin | L | 2-0 | |
| Hylo Open | 11/01 14:50 | 5 | Sitthikom Thammasin v Daren Liew | L | 0-2 | |
| French Open | 10/27 11:40 | 4 | Viktor Axelsen v Sitthikom Thammasin | L | 2-0 | |
| French Open | 10/26 08:00 | 5 | Shi Yu Qi v Sitthikom Thammasin | W | 0-2 | |
| Denmark Open | 10/18 07:00 | 5 | Kean Yew Loh v Sitthikom Thammasin | L | 2-0 | |
| Japan Open | 08/30 03:00 | - | Guang Zu Lu v Sitthikom Thammasin | L | 2-1 | |
| World Championships | 08/25 04:10 | 4 | Viktor Axelsen v Sitthikom Thammasin | L | 2-0 | |
| World Championships | 08/23 01:00 | 5 | Sitthikom Thammasin v Tze Yong Ng | W | 2-1 | |
| World Championships | 08/22 00:15 | 6 | Kanta Tsuneyama v Sitthikom Thammasin | W | 1-2 | |
| Singapore Open | 07/13 03:55 | 5 | Sitthikom Thammasin v H.S. Prannoy | L | 0-2 | |
| Malaysia Open | 06/30 06:00 | - | Anthony Sinisuka Ginting v Sitthikom Thammasin | L | 2-0 | |
| Malaysia Open | 06/28 06:40 | 5 | Chico Aura Dwi Wardoyo v Sitthikom Thammasin | W | 1-2 | |
| Indonesia Open | 06/14 05:20 | 5 | Zii Jia Lee v Sitthikom Thammasin | L | 2-0 | |
| Indonesia Masters | 06/09 06:30 | - | Anthony Sinisuka Ginting v Sitthikom Thammasin | L | 2-0 | |
| Indonesia Masters | 06/08 07:20 | - | Khosit Phetpradab v Sitthikom Thammasin | W | 1-2 | |
| Thomas Cup | 05/09 13:20 | - | Shesar Hiren Rhustavito v Sitthikom Thammasin | L | 2-0 | |
| Thomas Cup | 05/08 13:20 | - | Yun Gyu Lee v Sitthikom Thammasin | W | 0-2 | |
| Asia Championships | 04/27 11:00 | 5 | Sitthikom Thammasin v Anthony Sinisuka Ginting | L | 1-2 | |
| Korea Masters | 04/16 02:20 | - | Sitthikom Thammasin v Hyeok Jin Jeon | L | 0-2 | |
| Korea Masters | 04/15 04:00 | - | Sitthikom Thammasin v Guang Zu Lu | W | 2-1 | |
| Korea Masters | 04/14 03:20 | - | Arnaud Merkle v Sitthikom Thammasin | W | 1-2 |